What do a cat, checkerboard, basketball, calculator and open book have in common?

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To find out what a cat, checkerboard, basketball, calculator, and open book have in common, you can follow these steps:

1. Go to the puzzle forum that you have mentioned and create a post.
2. Clearly state your question: "What do a cat, checkerboard, basketball, calculator, and open book have in common?"
3. Provide any additional information or context that might be relevant to the question.
4. Wait for responses from other members of the puzzle forum who might have insights or solutions.
5. Engage with the forum community to discuss and analyze different ideas and possibilities.
6. Consider any hints or suggestions provided by other participants.
7. Evaluate the responses and try to identify common patterns or connections between the items mentioned.
8. Once you have identified the commonality, you can share the answer on the puzzle forum for others to see and discuss.

Remember, the puzzle forum will provide a platform for collaboration and brainstorming, allowing you to benefit from the collective intelligence of other puzzle enthusiasts.